Adjusting the purity of various gases in air separation equipment is a complex and delicate process. By controlling the composition of the raw air, optimizing the mass transfer efficiency inside the tower, accurately managing operating conditions, and taking specific adjustment steps and precautions, the purity of the gas can be effectively improved to meet production needs.
Basic methods for adjusting gas purity:
1. Control the composition of raw air: The composition of raw air is affected by external conditions such as humidity and temperature, which in turn affects the content of water vapor and carbon dioxide. These impurities will condense at low temperatures, thereby reducing the purity of the gas. Therefore, appropriate measures need to be taken, such as using dryers, filters, etc., to purify the raw air and reduce impurity content.
2. Optimize the mass transfer efficiency inside the tower: The gas-liquid mass transfer efficiency determines the nitrogen oxygen separation effect. If the mass transfer efficiency of the packing or heat exchanger inside the tower is low, the separation effect will deteriorate, leading to an increase in impurity content in the gas. Mass transfer efficiency can be improved by improving packing design, optimizing heat exchanger structure, and other methods.
3. Precise management of operating conditions: Pressure and temperature are key factors affecting gas purity. Pressure fluctuations or temperature changes inside the tower can affect the evaporation and condensation rates of gases, thereby affecting purity. Operators need to precisely control these two parameters to ensure the stable operation of the system. Accurate control of pressure and temperature can be achieved by adjusting valves, reflux ratios, and other methods.
